Work

A Four-channel Optically Pumped Magnetometer for a Magnetoencephalography Sensor Array

Year: 2023

Type: preprint

Abstract: We present a novel four-channel OPM sensor for magnetoencephalography that utilizes a two-color pump/probe scheme on a single optical axis. We characterize its performance across 18 built sensor modules. The new sensor implements several improvements over our previously developed sensor including lower vapor-cell operating temperature, improved probe-light detection optics, and reduced optical power requirements. The sensor also has new electromagnetic field coils on the sensor head which are designed using stream-function-based current optimization. We detail the coil design methodology and present experimental characterization of the coil performance. The magnetic sensitivity of the sensor is on average 12.3 fT/rt-Hz across the 18 modules while the average gradiometrically inferred sensitivity is about 6.0 fT/rt-Hz. The sensor 3-dB bandwidth is 100 Hz on average. The on-sensor coil performance is in good agreement with the simulations.

Source: PubMed

DOI: 10.48550/arxiv.2312.14623

Authors: Iivanainen, Joonas, Carter, Tony R., Dhombridge, Jonathan E., Read, Timothy S., Campbell, Kaleb, Abate, Quinn, Ridley, David M., Borna, Amir, Schwindt, Peter D. D.

Institutions: Sandia National Laboratories, University of New Mexico

Language: English

Topic: Atomic and Subatomic Physics Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, National Institutes of Health, National Nuclear Security Administration, Sandia National Laboratories

Awards: G11630931, G2339225706, G413247060, G855168022

OpenAlex ID: W4390215001

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